Phonograph-reproducer and record therefor.



c. 0. SMITH. PHONOGRAPH REPRODUCER AND RECORD THEREFOR.

APPLICATION FILED NOV- 51 I9I6- Patented Mar. 26

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*PEOBKQGEAPH-EEFROLUUCER AND RESORT THEREEUIEL specification ofLettcrs IPatent.

Patented Man luliiq summation filed November 6; 1916. serial Ho. 2129,7fif2.

To all whom it may concern: v,

Be it known that '1, Guam l). SMITH, a citizen of the United States, and resident of San dose, in the county of Santa Clara and State of Gsli'fornia, have invented certain new and useful improvements in Phonogsaph-Reproducers and Records Therefor, of which the following; is a specification.

My invention relates to a phonograph repioducer aud the record theieior, and the object of my invention is to provide a phonograph repsoducer and record that will produce souudso'f greater volume and carrying power tbauthose now general use. Another objec': is twprovide a mechanism by which imperfections in the riulording and rep}? ducingyv ofoigs l all of the device may be render' "l' less notice ale by the other half P above other objects in view, f in novel and useprov s n, jio riuation, construction, comtioii and relative arrangement of parts iaeina" e11 desccibc'd, shown in tbe drafand pointed out in the claims. .In the dra Figure l a side clevationof roy invention, a part of tho' record being broken E3 is an edgewisc view of my invention, one half being in section,

3 a side elevation of the sound diverting plate Fig. i is a plan view of the record with a portion of the parallel grooves omitted.

I Fig. '5 illustrates a sound bor. embodyingmy invention in which the diapliragms are placed parallel to each other.

Fig. 8 is a detail elevation of a needle with a double, shank adapted :lfoi use in my improved reproducer.

Similar characters of reference refer to similar parts throughout the several views.

Referring now more particularly to the drawings, 1 indicates a circular u shaped sound box having a diaphragm 2 fitted in each side thereof in the manner usual in the construction of such devices. A vibratin stem 3 is connected at one end to each diaphragm by means of a threaded pin 3* securely fastened to said diaphragm and passing through the end of said stem and held securely to said stem by nuts 3 screwed onto in 3, one on each side of said stem e other end of stem 3 is fitted with desired. The lowermost portion of stem u upon simultaneously and a socket 4 adapted to receive needle 5 which is held in position by set screw 6. Thc upr portion of stem 3 is bent so as to paral el the surface of diaphragm 2 but is bent inwardly toward the lower end thereof being secured to the lowermost portion of f the circumference of sound box 1. A. cliisei edged fulcrum may be lntroduced at 8* if Q in which is formed socket lis formed und adjusted to lie in a plane substantially par allel with a diametrical. plane passing through said drum midway between said diaphraglns 2. At 10 is shown a sound plate provided with an orifice 11. At 12 is shown a sound diverting plate circular in form and completely separating the two halves of sound box 1. Plate 12 is hollowed out on each side from a point below the center thereof to the outer circumferenceas shown at 13. At 14 is provided an opening in the upper surface of sound box 1 to which attached sound conveyor 15. A second and smaller tube 16 is connected. to the lower end of conveyor as indicated at 1'1, or directly to any point on the circumference of sound box. 1 as indicated in dotted lines at At 19 I have shown a double cut disk'i ecord adapted to be operated upon simultaneously by needles 5-5. Each of the two grooves 20 is an exact, but reversed counterpart of the other, consequently when the device in operation the two diaphragms 2 are acted the same vibration but in opposite directions.

lhe sound waves thrown oil by diaphragms Zpass through orifices l1 and are diverted upwardly by plate 12 until they join and augment each other at opening 1 and p'ass through sound conveyor 15 to the point of discharge. The volume of sound emitted by a double reproducer of this kind is practically. double that of the single reproducer and therefore is desirable for use in large halls for concerts, entertainments, etc. In order to increase the carrying qualities of said augmented sounds air under pressure and in desired quantities is forced through tube 16 into sound box 1 or sound conveyor 15 from. any suitable source of supply as receive exactly lild lllll with a record having scribed and indicated at'16, the quantity being governed by the pressure applied thereto and by valve 21.

The two nuts 3 permit a very accurate adjustment of stem 3 so as to provide the proper tension of diaphragm 2 and the precise positioning of needles 5. The device hereinbefore described is designed for'use grooves provided with a laterally undulatory surface, but it is understood that changes may be made to adapt the invention for use on a record provided with grooves having a vertically undulatory surface.

In operating my improved phonograph, if one of grooves 20 is imperfect in any respect or at any point or points, and as a consequence one of said diaphragms 2 transmits animperfectvibration and as a result an imperfect sound wave reaches sound conveyer 15, then this Wave is met by a perfect Wave transmitted by the opposite diaphragm and a more perfect charged-from conveyor -15, since a perfect Wave from one diaphragm would naturally render an imperfect o'vave from the other diaphragm less noticeable. As a result of this dual construction an even, smooth succession of sounds of great volume are discharged by sound conveyor 15.

It is my desire to cover broadly a double sound box and record of the' character deeithcr a single or double sound box provided with an air inlet as described, therefore I do not Wish to confine myself to the specific mechanism herein shown and described but to make such alterations and changes in form, construction and operation as may be necessary to meet exigencies of practical application and manufacture and Within the scope of the aplpendefil clainilsi e ma e int c For instance, plate 13 may form indicated in dotted lines at 22 and may form a part of sound plate 10, or the diaphragms 2 may be placed parallel to each other as indicated in Fig. 5 in which the circular sound box is indicated by 1.

Having thus described my invention, what fixed ll claim as new and desire to secure by Let ters Patent, 1s

1. In a phonograph, a reproducer com prising a pair of opposed, cooperating souhd wave is consequently dis- I more to both of reproducers having a sound conveyer common to both ofthem and independently operating means for producing simultaneous and equal opposed vibrations in each of, them. 2; In a phonograph, a reproducer com-- prising a pair of opposed, cooperating sound reproducers having a sound con'veyer common to both of them and means for producing simultaneous and equal opposed vibrab10115 in each-of them, said means comprismg a revolving record having a pair of reversed duplicate sound record grooves formed therein, each of said grooves being adapted to cooperate with one of said pair of opposed cooperating sound reproducers.

3.' In a phonograph, the combination with a record having a pair of reversed duplicate sound record groove s formed therein, of a reproducer provided with a pair of opposed cooperating diaphragms each dia phragm having a stylus operativcly attached thereto, and each stylus being independently mounted on said reproducer and adapted to operate in one of said grooves.

i. A phonograph reproducer comprising a sound box having a sound conveyor attachd thereto, a sound diverting plate positioned in the diainetrical median plane 'side of said sound diverting plate, and independentlysoperating means for imparting simultaneous and equal opposed vibrations to said diaphragms.

In a phonograph, a reproducer com prisin a pair of opposed cooperating sound reprod ucers havin a sound conveyer comt em, and independently operating means adjustably connected to said opposed cooperating sound reproducers for producing simultaneous and equal opposed sound vibrations in each of them.

6. The combination of double phonograph reproducer and a record having a pair of reversed duplicate; sound record grooves formed therein. v-

In testimony whereolil" have hereunto atmy signature this 27th day of" October, 1916.

GHARLES D. SMH.

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